Uranography & Atlas . unzione a S, come una piccola luna piena; e al suo greatestelongation come stella del mattino a W. nelle sue stagioni, inoltre, lei deve sperimentare amuch differenza superiore è noto su ourearth; per il suo asse si inclina di circa 75 gradi per theplane della sua orbita e al suo equatore essa deveavere le due molle, due estati, come molti in autunno,e due inverni in ciascun anno. Questo pianeta è una costante attendant su thesun, dal quale non ha mai rimuove più di 48gradi, e di conseguenza non è mai visto a metà notte né in opposizione a quello luminary, beingvisible solo per tre o quattro ore in

• Collaboratore: The Reading Room / Alamy Foto Stock
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Uranography & Atlas . unction at S, as a small full moon; and at her greatestelongation as morning star at W. In her seasons, also, she must experience amuch greater difference than is known upon ourearth; for her axis inclines about 75 degrees to theplane of her orbit, and at her equator she musthave two springs, two summers, as many autumns, and two winters, in each year. This planet is a constant attendant upon thesun, from which she never removes more than 48degrees, and consequently is never seen at mid-night, nor in opposition to that luminary, beingvisible only for three or four hours in the morningor evening, according as she is before or after thesun. When she rises before the sun, she is seenfrom the earth to the westward of him, and is VENUS. 213 called the morning star; but when she sets afterhim, she is eastward of him, and is then an even-ing star. She is alternately one or the other about290 days. The following drawing shows the appearanceof Venus when viewed through a very powerfultelescope:. Venus, like Mercury, sometimes passes over thesuns disc, but the transits of Venus occur muchless frequently than those of Mercury; they havethis peculiarity, that the spaces of time betweenthe five transits are 8 years, 122 years, 8 years, and 105 years, and that they can happen only inthe months of June and December. The firstobservation of a transit of Venus was made byHorrox in 1639. The following is a list of all thetransits of Venus which have occurred or willoccur, from 1639 to the 22d century. 1639 Dec. 4. 1882 Dec. 6. 1761 June 5. 2004 June 7. 1769 June 3. 2012 June 5. 1874 Dec. 8. 15 214 VENUS. The transit of June 5th, 1761, was not verysuccessfully observed. That of June 3d, 1769, was observed by astronomers with great care inevery part of the globe. Among the most suc-cessful, were those of a committee of the AmericanPhilosophical Society, at the head of w7hom wasRittenhouse. The observations of both transitshave been reduced with great care by Encke, w

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• bo
• bookcentury1800
• bookdecade1850
• bookpublishernp
• bookyear1850